Objective:
Identify optimal potash and phosphate requirements for soybean grown in rotation with corn. Determine the influence of Bradyrhizobia inoculation on soybean yield and nutritional status in multiple production systems. Define best fertilizer management strategies for wheat/soybean double crop systems.

Approach:
Plant soybean corn on lighter textured soils commonly used for corn or cotton production. Apply multiple rates of potash or phosphate to both corn and soybean with other essential nutrients applied according to soil test results. Maintain plot integrity throughout study. Conduct tests at multiple locations when possible. Inoculate soybean with multiple available inoculants and plant soybean in rotation with cotton, corn and soybean to determine when seed inoculants are needed to optimize yield. Grow Maturity Group IV and V soybean following wheat. Investigate multiple fertilization strategies and timing for optimal input.